smith thompson



@nite-h tetes genet @Hire Leim Pam No. 75,315, dated Mm. 1'0, 186s.

IMPROVEMENT IN DEVICES FOR PREVENTING WATER-PRES FROM BURSTING.

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TO ALL WHOM IT MAY' CONCERN: l

Beit known that I, It. H.- SMITH THOMPSOS, of Georgetown, in the District 'of Columbia, have invented a new and improved Mode of Preventing Water-Pipes from Bursting by Freezing; and I do hereby declare that the following is a full and'exact description thereof, reference being had to the'accompanying drawings, and to the letters of reference marked thereon. i Y

The nature ot"my invention consists in-providing a water-pipe at given intervals witha shoulder, giving increased diameter to thepipe. In the receptacle so formed is to be placed a double cylinder, with au air-cushion between the interior cy1inder,tobe of flexible material, which will give as the pressure increas'es,'and furnish the extra space required by the'expansion ofthe freezing water. l

To -enable others skilled in the art to make Vand use my invention, I will proceed to describe its construction and operation.

I construct my water-pipe of any of the known forms, but increasing the diameter at the end of-each section of pipe, as shown at A, fig. 1, in order that .it may receive the double cylinder Bt Thisdouble cylinder I in 'general make in the following manner. I construct afcylinder of ,metaL'of a diameter nearly equal to the increased diameter at the end of the pipe; Within this I place another cylinder of elastic material, as shown atA, iig. 2. These two cylinders I connect together by a ring, C, fig. 2, at each end of the cylinders, which is bolted or screwed to an inward-projectinglnnge of the metal cylinder, between which flange and the ring the ends of the elastic cylinder'A, tig. 2, are first drawn, being thus clamped securely to the outer metallic cylinder,

`so as to leave an air-cushion between them. The dimensions of this ring I malte such that the diameter 'of the interior elastic cylinder may be thev same as thatcf the pipe, so as not to interfere with the flow of water through the pipe. When the water begins to freeze, it expands, causing increased pressure-outward. This increased pressure is relieved by the stretching of the'elastic cylinder A, fig. 2, thus furnishing the extra space required, and preventing the bursting ofthe pipe.

' What I claim as my invention= and desire to secure by Letters Patent, is-

The arrangement at the joints of water-pipes of two concentric cylinders, the interior cylinder to he of elastic material, and thus form an air-cushion, and to operate substantially as described.

' n.- H. SMITH THOMPSON.

Witnesses J No.1 S. KIDWELL, Gao. I. LYELL. 

